US10750057B2 - Setting ink use limits for a printing system - Google Patents
Setting ink use limits for a printing system Download PDFInfo
- Publication number
- US10750057B2 US10750057B2 US16/335,655 US201616335655A US10750057B2 US 10750057 B2 US10750057 B2 US 10750057B2 US 201616335655 A US201616335655 A US 201616335655A US 10750057 B2 US10750057 B2 US 10750057B2
- Authority
- US
- United States
- Prior art keywords
- ramps
- neugebauer
- color
- ink
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007639 printing Methods 0.000 title claims abstract description 86
- 238000012360 testing method Methods 0.000 claims abstract description 159
- 239000013598 vector Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000013442 quality metrics Methods 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims description 33
- 239000003086 colorant Substances 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 4
- 238000004581 coalescence Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000000976 ink Substances 0.000 description 149
- 238000013507 mapping Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 230000003993 interaction Effects 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000001419 dependent effect Effects 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- -1 metallic Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00832—Recording use, e.g. counting number of pages copied
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/605—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis for controlling ink amount, strike-through, bleeding soakage or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/34—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for coin-freed systems ; Pay systems
- H04N1/346—Accounting or charging based on a number representative of the service used, e.g. number of operations or copies produced
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
- H04N1/6041—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis for controlling uniformity of color across image area
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
- H04N1/6052—Matching two or more picture signal generators or two or more picture reproducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6075—Corrections to the hue
Definitions
- Printing systems may be arranged to produce an image (in two or three dimensions—2D or 3D) based on input data.
- color data for the image may be represented in a first color space.
- color data for the image may be represented in a Red, Green, Blue (RGB) color space.
- FIG. 1 is a schematic diagram showing a printing system according to an example
- FIG. 2 is a flow diagram showing a method of setting ink use limits for a printing system according to an example
- FIG. 3 is a grayscale representation of a first set of color ramps according to an example
- FIG. 4 is a grayscale representation of a first set of color ramps according to an example
- FIG. 5 is a grayscale representation of a second set of color ramps according to an example
- FIG. 6 is a grayscale representation of a second set of color ramps according to an example
- FIG. 7 is a representation of a Neugebauer Primary color space according to an example.
- FIG. 8 is a schematic diagram showing a processing device according to an example.
- a printing system may have a limited number of output channels, such as available colorants. As such, it may be necessary to map color data to a second color space, defined by the available output channels, that is used to produce the output. Area coverage representations, such as Neugebauer Primary area coverages for example, may be used to implement this second color space. A color mapping may be used to map color data from a print job to the second color space.
- Color calibration may for example be used to adjust the color response of the printing system to more accurately correspond to a desired color to be printed.
- Color calibration may be used to calibrate a color mapping process by which a first representation of a given color is mapped to a second representation of the same color.
- “color” is a concept that is understood intuitively by human beings, it can be represented in a large variety of ways. For example, in one case, a color as observed visually by an observer may be related to a power or intensity spectrum of electromagnetic radiation across a range of visible wavelengths. In other cases, a color model is used to represent a color at a lower dimensionality.
- color models make use of the fact that color may be seen as a subjective phenomenon, i.e. dependent on the make-up of the human eye and brain.
- a “color” may be defined as a category that is used to denote similar visual perceptions; two colors are said to be similar if they produce a similar effect on a group of one or more people. These categories can then be modelled using a lower number of variables.
- a color model may define a color space.
- a color space in this sense may be defined as a multi-dimensional space, with a point in the multi-dimensional space representing a color value and dimensions of the space representing variables within the color model.
- RGB Red, Green, Blue
- an additive color model defines three variables representing different quantities of red, green and blue light.
- Other color spaces include: a Cyan, Magenta, Yellow and Black (CMYK) color space, in which four variables are used in a subtractive color model to represent different quantities of colorant or ink, e.g.
- CIE International Commission on Illumination
- XYZ XYZ color space
- Z Z’ or tristimulus values
- CIE 1976 L*, a*, b*-CIELAB or ‘LAB’
- Yu‘v’ color space
- three variables represent the luminance (‘Y’) and two chrominance dimensions (u‘ and v’).
- NPac Neugebauer Primary area coverage
- An NPac vector in the NPac color space represents a statistical distribution of one or more Neugebauer Primary vectors over an area of a halftone.
- a Neugebauer Primary is one of 2 k combinations of k inks within the printing system. For example, if a printing device uses CMY inks there can be eight Neugebauer Primaries.
- a Neugebauer Primary may comprise an overprint of two available inks, such as a drop of Magenta on a drop of Cyan (for a bi-level printer) in a common addressable print area (e.g. a printable “pixel”).
- Other examples may also incorporate multi-level printers, e.g. where print heads are able to deposit N drop levels; in this case an Neugebauer Primary may include one of NA combinations of k inks within the printing system.
- An NPac space provides a large number of metamers. Metamerism is the existence of a multitude of combinations of reflectance and emission properties that result in the same perceived color for a fixed illuminant and observer.
- Each NPac vector may therefore define the probability distribution for one or more colorant or ink combinations for each pixel in the halftone (e.g. a likelihood that a particular colorant or ink combination is to be placed at each pixel location in the halftone).
- a given NPac vector defines a set of halftone parameters that can be used in the halftoning process to map a color to one or more NPac vectors to be statistically distributed over the plurality of pixels for a halftone.
- the statistical distribution of Neugebauer Primaries to pixels in the halftone serves to control the colorimetry and other print characteristics of the halftone.
- Spatial distribution of the Neugebauer Primaries according to the probability distribution specified in the NPac vector may be performed using any suitable halftoning methods as is known in the art.
- suitable halftoning methods include matrix-selector-based Parallel Random Area Weighted Area Coverage Selection (PARAWACS) techniques and techniques based on error diffusion.
- PARAWACS matrix-selector-based Parallel Random Area Weighted Area Coverage Selection
- An example of a printing system that uses area coverage representations for halftone generation is a Halftone Area Neugebauer Separation (HANS) pipeline.
- Examples described herein relate to color calibration for printing based on NPacs, for example using a HANS pipeline.
- the color calibration may involve calibration of a color mapping from a device-dependent color space such as RGB or CMYK, for which a given color value may have a different perceived color when printed by different printing systems, to an NPac color space. Such examples will be described further below.
- Printing systems may be configured to favor particular print attributes.
- the print attributes may relate to, amongst others, color constancy, efficient use of output elements, robustness, and metamerism under a set of conditions.
- the use of area coverage representations enables one metamer, i.e. an output color value in an output color space, to be selected from a set of metamers to modify, e.g. optimize, one or more of these printing attributes.
- a particular output color value in the form of a NPac vector may be selected from a set of NPac vectors that map to a common input color value.
- an area coverage representation in the form of an NPac vector may be selected to minimize a change in observed color of an image output when subject to variations in the printing system, i.e. on a basis of increased robustness.
- n or four dimensions of a comparative colorant space may be contrasted with the n or four dimensions of a comparative colorant space and the three dimensions of an input tristimulus color space (such as a RGB or Commission Intemationale de l'Éclairage (CIE) XYZ based color space).
- an input tristimulus color space such as a RGB or Commission Intemationale de l'Éclairage (CIE) XYZ based color space.
- a given input color value may map to more than one output color value (i.e. more than one NPac vector)
- some output color values may produce undesirable results. For example, for a given substrate type, depositing an excessive amount of a single colorant may cause damage to the substrate. Similarly, depositing an excessive amount of a combination of colorants may cause damage to the substrate. Even if excessive amounts of colorant do not cause significant damage to a substrate, their deposit may be inefficient, may cause inversions in the colorant-color relationship in which beyond a certain limit chroma is lost, or may introduce artefacts in the resulting image, such as graining, coalescence or mottle.
- ink use limits may be set for the printing system.
- the ink use limits may define a limit on the amounts of ink that can be deposited on a particular substrate. This may help to avoid putting down more ink than is necessary. It may also help to avoid issues in building resources (i.e. determining combinations of Neugebauer Primaries) during printing operations.
- Perfectant ink use limits may be set (i.e. for each ink channel) as well as total use ink limits (i.e. defined for combinations of ink channels). The methods described below relate to defining those ink use limits in respect of the output color values in the form of NPac vectors. This allows ink use limits to be defined over a full dimensionality of the area coverage representation space, side-by-side versus overprinted halftoning to be precisely controlled and a large range of choices for how to deposit a combination of inks.
- Ink use limits may be defined in terms of an amount of ink. For example, this may be defined in terms of a particular mass or weight of ink for a given addressable area of print substrate, e.g. a print resolution pixel. In one case, an ink use limit may be 6 ng at a 1200 dpi resolution, meaning that the NPac vector should not use more than 6 ng per print resolution pixel. In such an example where a drop weight (i.e. the weight of each drop of ink) for each ink is 3 ng then for a Neugebauer primary that uses a single ink without overprinting can be printed at 100% area coverage since that weight (3 ng) is within the 6 ng ink use limit.
- a drop weight i.e. the weight of each drop of ink
- Two drops can also be printed at 100% area coverage since the weight of the two drops (6 ng) is also within the 6 ng ink use limit.
- the ink channel can only be printed at 66.6% area coverage to be within the ink use limit (i.e. with 33.3% blank Neugebauer Primary).
- FIG. 1 shows an example printing system 100 . Certain examples described herein may be implemented within the context of this printing system.
- the printing system comprises a printing device 110 , a memory 120 , a print controller 130 , and a measurement interface 140 .
- the printing device 110 is to print a plurality of colorants to a print substrate to produce a print output 150 .
- the print output 150 may, for example, comprise colored inks deposited on a substrate.
- the substrate may be paper, fabric, plastic or any other suitable print medium.
- the printed output may be a 3D printed object.
- the substrate may be a build material in the form of a powder bed comprising, for example, plastic, metallic, or ceramic particles.
- Chemical agents referred to herein as “printing agents”, may be selectively deposited onto a layer of build material.
- the printing agents may comprise a fusing agent and a detailing agent.
- the fusing agent is selectively applied to a layer in areas where particles of the build material are to fuse together, and the detailing agent is selectively applied where the fusing action is to be reduced or amplified.
- colorants may be deposited on a white or blank powder to color the powder.
- objects may be constructed from layers of fused colored powder.
- the memory 120 comprises test data 160 .
- the test data 160 may include, for example, first test data comprising a first set of NPac vectors, which define a first set of color ramps for a set of Neugebauer Primaries available with the plurality of colorants.
- Each color ramp comprises a plurality of test areas, with each test area being defined by a different NPac vector.
- the test areas are areas of the substrate in which ink is deposited during a test print.
- the ramps are a series of test areas with different amounts of ink deposited per pixel (i.e. different area coverages) within each test area of the ramp.
- the NPac vectors for each ramp are defined by monotonically-varying vector element values for a single corresponding non-blank Neugebauer Primary.
- the test data 160 may also include second test data comprising a second set of NPac vectors, which define a second set of color ramps for combinations of the set of Neugebauer Primaries. Test areas for each color ramp are defined by monotonically-varying vector element values for one Neugebauer Primary in a combination and the second set of ramps are defined by monotonically-varying vector element values across said ramps for another Neugebauer Primary in the combination.
- the Neugebauer Primaries are limited by the Neugebauer Primary ink use limits.
- the print controller 130 receives test data 160 from the memory 120 .
- the test data 160 may comprise color data as represented in an input color space, such as pixel representations in an RGB color space.
- the input color space may be device-dependent or colorimetric.
- the print controller 130 maps the color data from an input color space to an output color space for use by the printing device 110 to generate the print output 150 .
- a color mapping may be used.
- the color mapping may take the form of a look-up table (LUT) tabulating a correspondence between input color space values, such as RGB values, and output space color values, such as NPac vectors. Data points to effect this correspondence may be referred to as “nodes” of the look-up table, e.g.
- a certain RGB value is mapped to a certain NPac vector.
- input in a device-dependent color space may be first mapped to a colorimetric color space, before being mapped to NPac space.
- the output color space may be device-dependent. Certain examples described below provide a configuration, e.g. in certain cases an optimization, of such a color mapping.
- the measurement interface 140 is to receive indication of test areas that meet image quality metrics.
- the measurement interface 140 may transmit information regarding indicated test areas to the print controller 130 .
- the print controller 130 may store information regarding indicated test areas in the memory 120 .
- the print controller 130 may, as described below, modify the color mapping based on the indicated test areas.
- the print controller 130 may store, in the memory 120 , ink use limits.
- the print controller 130 may store, in the memory 120 , single-ink Neugebauer Primary ink use limits based on NPac vectors for the test areas for the first set of color ramps indicated via the measurement interface 140 .
- the print controller 130 may also store, in the memory 120 , ink use limits for the printing system based on NPac vectors for the test areas for the second set of color ramps indicated via the measurement interface 140 .
- FIG. 2 shows a method 200 of setting ink use limits for a printing system, such as the printing system described above with reference to FIG. 1 .
- a test area that meets an image quality metric is determined for each of a first set of color ramps for a set of available Neugebauer Primaries, the test area for each ramp being defined by monotonically-varying vector element values for a corresponding non-blank Neugebauer Primary.
- the test area may be determined by inspecting the ramps for test areas which exhibit characteristics related to undesirable ink-substrate interactions, which indicate that an ink coverage in the respective test area exceeds the desired ink use limits.
- the first set of color ramps may be visually inspected by a user.
- the first set of color ramps may be inspected for mottle (I.e. the appearance of darker or lighter spots), graining, or gloss non-uniformity.
- the first set of color ramps may be inspected to determine test areas in which the substrate is physically deformed (e.g. wrinkling or curling of the substrate).
- colorimetric or other measurements of the first set of color ramps may be made to determine undesirable characteristics. For example, the hue of the resulting Neugebauer Primary may be measured. Test areas with an area coverage below the area coverages of test areas which exhibit characteristics related to undesirable ink-substrate interactions are considered to be at or within the ink use limit.
- first set of color ramps is printed with the printing system.
- Each printed color ramp comprises a plurality of test areas.
- Each test area is printed based on a different NPac vector.
- the test areas for each ramp are defined by monotonically-varying element values for a single corresponding non-blank Neugebauer Primary.
- the ink coverage for the test areas in each ramp may step from a minimum ink coverage to a maximum coverage.
- the steps may be, for example, uniform steps with area coverage varying linearly.
- a ramp comprising three test areas may include test areas with 0% area coverage (100% blank Neugebauer Primary), 50% area coverage (50% blank Neugebauer Primary) and 100% area coverage (0% blank Neugebauer Primary).
- a ramp comprising four test areas may include test areas with 0% area coverage (100% blank Neugebauer Primary), 33.3% area coverage (66.6% blank Neugebauer Primary), 66.6% area coverage (33.3% blank Neugebauer Primary), and 100% area coverage (0% blank Neugebauer Primary).
- the first set of color ramps may be printed based on a preliminary Neugebauer Primary ink use limit.
- the preliminary Neugebauer Primary ink use limit may be chosen that is expected to be higher than an expected ink use limit for a particular ink-substrate combination.
- a different Neugebauer Primary ink use limit may be set for each Neugebauer Primary.
- the first set of color ramps may comprise ramps of single-ink and two-ink Neugebauer Primaries of the printing system.
- a new preliminary Neugebauer Primary ink use limit may be chosen (i.e. one with a higher ink use limit).
- Printing of the first set of color ramps may be repeated to produce a new first set of color ramps, and block 210 may be repeated to determine a test area for each of the new first set of color ramps that meet an image quality metric.
- printing of the first set of color ramps may be repeated to print a new first set of color ramps may be printed with a lower preliminary Neugebauer Primary ink use limit.
- printing of the first set of color ramps may be repeated to print a new first set of color ramps may be printed with more test areas per ramp.
- printing of the first set of color ramps may be repeated to print a new first set of color ramps may be printed with a smaller step in area coverage. Repeating printing of the first set of color ramps in these ways, and subsequently repeating block 210 may, for example, provide a more accurate identification of ink use limits.
- Neugebauer Primary ink use limits are set based on the determined test areas for the first set of color ramps.
- the first set of color ramps may provide a preliminary indication of NPac choices for Neugebauer Secondaries (i.e. two single-ink Neugebauer Primaries printed in combination and with the blank Neugebauer Primary).
- a test area that meets an image quality metric is determined for each of a second set of color ramps for combinations of the set of available Neugebauer Primaries.
- the test areas for each ramp are defined by monotonically-varying vector element values for one Neugebauer Primary in a combination and the second set of ramps are defined by monotonically-varying vector element values across said ramps for another Neugebauer Primary in the combination, wherein the Neugebauer Primaries are limited by the respective Neugebauer Primary ink use limit.
- the test area may be determined by inspecting the ramps for test areas which exhibit characteristics related to undesirable ink-substrate interactions, which indicate that an ink coverage in the respective test area exceeds the desired ink use limits.
- the second set of color ramps may be inspected for mottle (I.e. the appearance of darker or lighter spots), graining, or gloss non-uniformity.
- the second set of color ramps may be inspected to determine test areas in which the substrate is physically deformed (e.g. wrinkling or curling of the substrate).
- inspection of grain may be important when since certain combinations of Neugebauer Primaries may result in more grainy output than others.
- the second set of color ramps may be visually inspected by a user.
- colorimetric or other measurements of the second set of color ramps may be made to determine undesirable characteristics.
- the hue of the resulting Neugebauer Secondary may be measured. This may help to determine an appropriate balance of the use of Neugebauer Primaries in order to define a Neugebauer secondary (e.g. balancing cyan and magenta to define blue appropriately).
- Test areas with an area coverage below the area coverages of test areas which exhibit characteristics related to undesirable ink-substrate interactions are considered to be at or within the ink use limit.
- the second set of color ramps for combinations of the set of available Neugebauer Primaries is printed.
- the test areas for each color ramp are defined by monotonically-varying vector element values for one Neugebauer Primary in a combination and the second set of ramps are defined by monotonically-varying vector element values across said ramps for another Neugebauer Primary in the combination.
- the result is Neugebauer Secondaries (i.e. combinations of Neugebauer Primaries and the blank Neugebauer Primary) that are defined by a cross product of the intersecting Neugebauer Primaries in each respective test area.
- the Neugebauer Primaries used in the combinations are limited by the Neugebauer Primary ink limits set at block 220 .
- one ramp may vary from blank media to the single Neugebauer Primary ink use limit for a first Neugebauer Primary and a second intersecting ramp may vary from blank media to the single Neugebauer Primary ink use limit of a second Neugebauer Primary.
- the area coverage of the first Neugebauer Primary and the area coverage of the second Neugebauer Primary may be computed. If the sum of the two area coverages for the two Neugebauer Primaries (at their respective drop weights) is at or below the ink-limit a valid NPac is defined.
- ink use limits for the printing system are set based on the determined test area for each of the second set of color ramps.
- the end result of the entire process is to obtain the following: ink-limits for each of the Neugebauer Primaries (i.e. Cyan, Magenta Yellow and Black) and ink-limits for the Neugebauer Secondaries (Red, Green, Blue) as well as the balance of Magenta and Yellow (i.e. for Red—e.g. 70% Magenta, 30% Yellow), Cyan and Yellow (i.e. for Green) and Cyan and Magenta (i.e. for Blue).
- the ink use limits set at block 240 may be used in a subsequent printing operation to limit the NPac vector space available for use.
- the ink use limits may restrict the NPac vector metamers available in the color space mapping.
- NPac vectors falling outside of the ink use limits may be removed from a LUT representing the color mapping, e.g. removed as nodes.
- the LUT may be modified to indicate that NPac vectors falling outside of the ink use limits are unavailable under certain printing conditions; for example, those NPac vectors may be unavailable when the printing system is printing on a particular type of substrate.
- FIG. 3 is a grayscale representation of a first set of color ramps according to an example.
- the example shown in FIG. 3 is a set of ramps printed in a binary (i.e. two drop states: “drop” or “no drop”) CMYK printing system.
- CMYK binary
- Each of the two-ink Neugebauer Primaries is an overprint of one Neugebauer Primary with another Neugebauer Primary (i.e. a drop of one color is deposited and then a drop of another color is deposited in the same addressable print pixel).
- each ramp comprises ten test areas.
- the uppermost test area of each ramp (as shown in FIG. 3 ) has the lowest area coverage.
- the area coverage of the test areas increases towards the lowermost test area of each ramp.
- the ramps may be arranged in another orientation.
- the ramps may be stepped in area coverage from left-to-right or right-to-left or in any other direction.
- the test areas may be placed randomly provided their locations are known.
- the difference in area coverage between adjacent test areas is uniform across each ramp. That is, there are 16 test areas and the area coverage is varied in steps of 6.67% between 0% and 100% area coverage.
- the difference in area coverage may be smaller between some adjacent test areas than between other adjacent test areas.
- the difference in test areas may be reduced between adjacent test areas having area coverages close to an expected ink use limit (e.g. the preliminary ink use limit).
- FIG. 4 is a grayscale representation of a first set of color ramps for such a printing system according to an example.
- the printing system is capable of printing a maximum of three drops per ink channel per pixel.
- each ramp comprises ten test areas.
- the uppermost test area of each ramp (as shown in FIG. 4 ) has the lowest area coverage.
- the uppermost test area is 100% blank media (i.e. 0% area coverage).
- the area coverage of the test areas increases towards the lowermost test area of each ramp.
- the area coverage of the lowermost test area of each ramp depends on the amount of ink each Neugebauer Primary uses.
- a Neugebauer Primary may have a 3 ng drop weight and a 6 ng ink use limit and so area coverage for the lowermost test area in the ramp for that Neugebauer Primary will have an area coverage of 100%.
- FIG. 4 there are three single-ink Neugebauer Primaries per ink, at one, two, and three drops per ink channel per pixel.
- the number of single-ink Neugebauer Primaries per ink channel, and therefore the number of ramps printed per Neugebauer Primary may be scaled with the number of ink drops available per ink channel per halftone pixel.
- a Neugebauer Primary may have a 3 ng drop weight and a 6 ng ink use limit and so area coverage for the lowermost test area in the ramp for that Neugebauer Primary will have an area coverage of 66.6%.
- the cyan and magenta ink channels may contribute to combinations of one and two drops of each of cyan and magenta, resulting in CM, CMM, CCM, and CCMM Neugebauer primaries.
- FIG. 5 is a grayscale representation of a second set 500 of color ramps according to an example.
- the second set 500 of color ramps comprises so-called squares 510 a - 510 f of test areas.
- the square are a 2D array of test areas with ramps running in orthogonal directions.
- Each of the squares 510 a - 510 f comprises test areas in which two single-ink Neugebauer Primaries are combined.
- each of the combinations of single-ink Neugebauer Primaries are printed side-by-side with no overprint of one single-ink Neugebauer Primary with another single-ink Neugebauer Primary.
- the print controller 130 may define control data for depositions with each combination of Neugebauer Primaries.
- control data may include a distribution vector that specifies a distribution of Neugebauer Primary depositions, e.g. a probability distribution for each Neugebauer Primary or Neugebauer Primary combination for a pixel of a print image or, in other words, an area coverage vector for a set of Neugebauer Primary combinations or overprints.
- the control data may be processed via a halftoning stage such as PARAWACS or error diffusion as described above.
- one of the Neugebauer Primaries of the combination is varied in one direction (e.g. the x direction) from no coverage to its respective Neugebauer Primary ink use limit and the other of the Neugebauer Primaries of the combination is varied in an orthogonal direction (e.g. the y direction) from no coverage to its respective Neugebauer Primary ink use limit.
- one direction e.g. the x direction
- an orthogonal direction e.g. the y direction
- a first row and a first column of each square correspond to the ramps printed in the first set of color ramps for the respective Neugebauer Primary.
- each ramp of each square 510 a - 510 f comprises up to ten steps, varying from no coverage to the Neugebauer Primary ink use limit.
- test areas for which a global ink use limit i.e. based on a total amount of ink of the Neugebauer Primaries of the combination
- the number of steps may be different.
- each of the Neugebauer Primaries of the combination is at its respective Neugebauer Primary ink use limit. All test areas above and to the left of this line are printed such that each of the Neugebauer Primaries has an area coverage below its respective Neugebauer Primary ink use limit.
- each Neugebauer Primary may have a drop weight of 6 ng and a single Neugebauer Primary ink use limit of 6 ng.
- each ramp can be varied between 0% area coverage (i.e. blank media) and 100% area coverage, in which case the diagonal line of test areas extending from the bottom left test area (i.e. the Neugebauer Primary ink use limit for one of the Neugebauer Primaries of the combination) to the top right test area (i.e. the Neugebauer Primary ink use limit for the other of the Neugebauer Primary of the combination) comprises test areas which varies monotonically from 100% area coverage of one Neugebauer Primary to 100% area coverage of another Neugebauer Primary. In these test areas, the combination of Neugebauer Primaries is printed such that the dots of the individual Primaries are printed side-by-side (i.e. there is no overprinting).
- FIG. 6 is a grayscale representation of a second set 600 of color ramps according to an example. Similar to FIG. 5 , there are six squares 610 a - 610 f corresponding to combinations of single-ink Neugebauer Primaries for a four ink channel CMYK printing system. As in FIG. 5 , in the upper left portion of each square, one of the Neugebauer Primaries of the combination is varied in one direction (e.g. the x direction) from no coverage to its respective Neugebauer Primary ink use limit and the other of the Neugebauer Primaries of the combination is varied in an orthogonal direction (e.g. the y direction) from no coverage to its respective Neugebauer Primary ink use limit. In the upper left portion of each square, each test area comprises combinations of Neugebauer Primaries that are printed side-by-side with no overprint.
- one direction e.g. the x direction
- orthogonal direction e.g. the y direction
- the test areas above and left of the diagonal line 620 of test areas extending from the bottom left test area (i.e. the Neugebauer Primary ink use limit for one of the Neugebauer Primaries of the combination) to the top right test area (i.e. the Neugebauer Primary ink use limit for the other of the Neugebauer Primary of the combination) represent combinations of Neugebauer Primaries that are printed side-by-side with each of the Neugebauer Primaries having an area coverage below its respective Neugebauer Primary ink use limit.
- the test areas below and to the right of the diagonal line 620 of test areas extending from the bottom left test area (i.e. the Neugebauer Primary ink use limit for one of the Neugebauer Primaries of the combination) to the top right test area (i.e. the Neugebauer Primary ink use limit for the other of the Neugebauer Primary of the combination) represent combinations of two-ink combinations printed side-by-side at the ink limit and the corresponding two-ink Neugebauer Primary (i.e. two inks overprinted).
- the combination is varied from 100% side-by-side printed color (i.e. two single-ink Neugebauer Primaries printed in combination) at the bottom left test area 630 and top right test area 640 of each square 610 a - 610 f , to 100% overprinted color (i.e. a two-ink Neugebauer Primary) at the bottom right test area 650 of each square 610 a - 610 f .
- 100% side-by-side printed color i.e. two single-ink Neugebauer Primaries printed in combination
- overprinted color i.e. a two-ink Neugebauer Primary
- the combination is varied from no overprinted CM Neugebauer Primary and 100% magenta at the bottom left test area 630 to 100% CM Neugebauer Primary at the bottom right test area 650 and from no overprinted CM Neugebauer Primary and 100% cyan at the top right test area 630 to 100% CM Neugebauer Primary at the bottom right test area 650 .
- the test areas comprise various combinations of cyan (C) and magenta (M) single-ink Neugebauer Primary in combinations with CM Neugebauer Primary.
- C cyan
- M magenta
- This allows for a choice of secondary (i.e. a combination of single-ink channels) that combines different relative proportions of side-by-side half toned color and overprinted color.
- the space in which this variation occurs is depicted for in FIG. 7 as a plane 710 extending between the ink use limits for each of the single-ink Neugebauer Primaries (C and M) and the CM two-ink Neugebauer Primary.
- the sets of color ramps described above with reference to FIGS. 3 to 6 may be used to set ink use limits for a printing system.
- the charts may be used to set ink limits when a new substrate type is to be used in the printing system.
- This may provide for a more flexible printing system in which a wide variety of substrates, each of which may absorb ink differently (e.g. due to different substrate thickness, the presence of coatings, and different finishes), can be printed without the properties of all of the substrates to be known and tested during development or installation. For example, it may enable new substrates, not previously printed on by the printing system, to be tested and ready for printing quickly and efficiently.
- further sets of color ramps may be printed to extend the testing of the Neugebauer Primary space further.
- the relative proportion of overprinted (i.e. multi-ink Neugebauer Primary) ink to combined single-ink Neugebauer Primary may be fixed and the relative proportions of the single-ink Neugebauer Primary may be varied.
- this is equivalent to a plane 720 in the CM axis of FIG. 7 .
- a ramp may be printed that transitions between the NPac vectors of the two test areas.
- this may be done for each combination of single-ink Neugebauer Primaries.
- FIG. 8 shows an example of a processing device 800 comprising a machine-readable storage medium 810 coupled to a processor 820 .
- the processing device 800 may comprise a stand-alone computing device, such as a desktop computer or server communicatively coupled to an imaging device; in other cases the processing device 800 may comprise part of a printing device or the like.
- the machine-readable medium 810 can be any medium that can contain, store, or maintain programs and data for use by or in connection with an instruction execution system.
- Machine-readable media can comprise any one of many physical media such as, for example, electronic, magnetic, optical, electromagnetic, or semiconductor media. More specific examples of suitable machine-readable media include, but are not limited to, a hard drive, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory, or a portable disc.
- the machine-readable storage medium comprises program code to implement the methods described above.
- an indication of a test area for each of a first set of color ramps that meets at least one image quality metric is received.
- the indication may be received at the measurement interface 140 .
- a first print operation is effected to produce the first set of color ramps for a set of available Neugebauer Primaries, each color ramp comprising a plurality of test areas, each test area being printed based a different NPac vector, wherein the test areas for each ramp are defined by monotonically-varying vector element values for a single corresponding non-blank Neugebauer Primary.
- Neugebauer Primary ink use limits based on the determined test areas for the first set of color ramps are stored.
- the single-ink Neugebauer Primary ink use limits may be stored in the memory 120 by the print controller 130 .
- an indication of a test area for each of a second set of color ramps that meets at least one image quality metric is received.
- the indication may be received at the measurement interface 140 .
- a second print operation is effected to produce the second set of color ramps for combinations of the set of available Neugebauer Primaries, wherein the test areas for each ramp are defined by monotonically-varying vector element values for one Neugebauer Primary in a combination and the second set of ramps are defined by monotonically-varying vector element values across said ramps for another Neugebauer Primary in the combination, wherein the Neugebauer Primaries are limited by the Neugebauer Primary ink use limits.
- ink use limits for the printing system based on the indicated test areas for each of the second set of color ramps are stored.
- the ink use limits for the printing system 100 may be stored in the memory 120 by the print controller 130 .
Abstract
Description
Claims (20)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2016/058498 WO2018080428A1 (en) | 2016-10-24 | 2016-10-24 | Setting ink use limits for a printing system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20190281191A1 US20190281191A1 (en) | 2019-09-12 |
US10750057B2 true US10750057B2 (en) | 2020-08-18 |
Family
ID=62025260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/335,655 Active US10750057B2 (en) | 2016-10-24 | 2016-10-24 | Setting ink use limits for a printing system |
Country Status (4)
Country | Link |
---|---|
US (1) | US10750057B2 (en) |
EP (1) | EP3455079A4 (en) |
CN (1) | CN109414937B (en) |
WO (1) | WO2018080428A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11447648B2 (en) | 2004-05-30 | 2022-09-20 | Kornit Digital Ltd. | Process and system for printing images on absorptive surfaces |
US8540358B2 (en) | 2009-08-10 | 2013-09-24 | Kornit Digital Ltd. | Inkjet compositions and processes for stretchable substrates |
US10623606B2 (en) * | 2017-02-15 | 2020-04-14 | Hewlett-Packard Development Company, L.P. | Linearizing print outputs for a printing system |
CN110268700A (en) * | 2017-04-19 | 2019-09-20 | 惠普发展公司,有限责任合伙企业 | Associated color and knob Jie fort primary colors |
WO2018194643A1 (en) * | 2017-04-21 | 2018-10-25 | Hewlett-Packard Development Company, L.P. | Color mapping resources |
US10728423B2 (en) * | 2017-07-24 | 2020-07-28 | Hewlett-Packard Development Company, L.P. | Colorant vector calibration |
WO2019077615A1 (en) | 2017-10-22 | 2019-04-25 | Kornit Digital Ltd. | Low-friction images by inkjet printing |
US20240010009A1 (en) * | 2020-07-29 | 2024-01-11 | Kornit Digital Ltd. | Inkjet printing method |
CN114862706B (en) * | 2022-04-25 | 2022-10-14 | 哈尔滨理工大学 | Tone mapping method for keeping gradient direction of image |
Citations (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5553199A (en) | 1994-05-03 | 1996-09-03 | Eastman Kodak Company | Method and apparatus for calibrating a four color printer |
US6776473B2 (en) | 2002-12-16 | 2004-08-17 | Lexmark International, Inc. | Method of mixing multi-level black and color inks in a printing system |
US6848768B2 (en) | 1999-11-12 | 2005-02-01 | Canon Kabushiki Kaisha | Color ink model processes for printers |
US20060139705A1 (en) | 2000-06-20 | 2006-06-29 | Piatt Michael J | Color printer calibration |
US7342593B2 (en) | 2002-11-01 | 2008-03-11 | Hewlett-Packard Development Company, L.P. | Color mapping methods, data signals, articles of manufacture, and color mapping apparatuses |
CN101401412A (en) | 2006-03-14 | 2009-04-01 | 佳能株式会社 | Color resolution method and video image processing device |
CN101544127A (en) | 2008-03-24 | 2009-09-30 | 兄弟工业株式会社 | Image-processing system |
WO2009138182A1 (en) | 2008-05-14 | 2009-11-19 | Padaluma Gmbh | Method for calibrating an inkjet printer and print product |
US20100085586A1 (en) * | 2008-10-06 | 2010-04-08 | Canon Kabushiki Kaisha | Target for color characterization of color printer |
US7742204B2 (en) | 2004-04-30 | 2010-06-22 | Electronics For Imaging, Inc. | Methods and apparatus for determining a total colorant limit for digital imaging devices |
CN101758665A (en) | 2008-12-25 | 2010-06-30 | 兄弟工业株式会社 | Print controller for controlling ink jet printer |
US20110096344A1 (en) | 2009-10-26 | 2011-04-28 | Jan Morovic | Printing System |
US7990592B2 (en) | 2008-05-27 | 2011-08-02 | Xerox Corporation | Methods and systems to produce consistent spot colors for multi-color print engines |
US8213055B2 (en) * | 2009-02-20 | 2012-07-03 | Hewlett-Packard Development Company, L.P. | Color separation into Neugebauer primary area coverage vectors |
US8270032B2 (en) * | 2009-10-26 | 2012-09-18 | Hewlett-Packard Development Company, L.P. | Generating color lookup table |
US8670167B2 (en) * | 2009-10-26 | 2014-03-11 | Hewlett-Packard Development Company, L.P. | Color gamut determination with neugebauer-primary area coverages for a print system |
US20150217587A1 (en) | 2012-07-31 | 2015-08-06 | Jacint Humet Pous | Continuous ink density selection method using a diagnostic plot in contone printers |
US9185266B2 (en) | 2011-06-21 | 2015-11-10 | Eastman Kodak Company | Method of creating an ICC profile for a printing system |
US20160034796A1 (en) | 2014-07-30 | 2016-02-04 | Hewlett-Packard Development Company, L.P. | Spectral print control based on specific spectral ranges of colorants |
EP2989782A1 (en) | 2013-04-22 | 2016-03-02 | Hewlett-Packard Development Company, L.P. | Spectral print mapping |
JP2016068358A (en) | 2014-09-29 | 2016-05-09 | 大日本印刷株式会社 | Printing method and printing system |
US20160255240A1 (en) * | 2013-10-30 | 2016-09-01 | Hewlett-Packard Development Company L.P. | Halftoning |
US9584700B2 (en) * | 2009-10-26 | 2017-02-28 | Hewlett-Packard Development Company, L.P. | Color separation table optimized for a printing process according to a print attribute by selecting particular Neugebauer primaries and Neugebauer primary area coverages |
US9609177B2 (en) * | 2013-01-29 | 2017-03-28 | Hewlett-Packard Development Company, L.P. | To generate a print specification color separation look-up table |
US20190238723A1 (en) * | 2016-10-24 | 2019-08-01 | Hewlett-Packard Development Company, L.P. | Color calibration |
US20200036866A1 (en) * | 2017-01-30 | 2020-01-30 | Hewlett-Packard Development Company, L.P. | Color calibration |
US10623606B2 (en) * | 2017-02-15 | 2020-04-14 | Hewlett-Packard Development Company, L.P. | Linearizing print outputs for a printing system |
-
2016
- 2016-10-24 EP EP16919949.4A patent/EP3455079A4/en not_active Withdrawn
- 2016-10-24 WO PCT/US2016/058498 patent/WO2018080428A1/en unknown
- 2016-10-24 US US16/335,655 patent/US10750057B2/en active Active
- 2016-10-24 CN CN201680087087.8A patent/CN109414937B/en active Active
Patent Citations (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5553199A (en) | 1994-05-03 | 1996-09-03 | Eastman Kodak Company | Method and apparatus for calibrating a four color printer |
US6848768B2 (en) | 1999-11-12 | 2005-02-01 | Canon Kabushiki Kaisha | Color ink model processes for printers |
US20060139705A1 (en) | 2000-06-20 | 2006-06-29 | Piatt Michael J | Color printer calibration |
US7342593B2 (en) | 2002-11-01 | 2008-03-11 | Hewlett-Packard Development Company, L.P. | Color mapping methods, data signals, articles of manufacture, and color mapping apparatuses |
US6776473B2 (en) | 2002-12-16 | 2004-08-17 | Lexmark International, Inc. | Method of mixing multi-level black and color inks in a printing system |
US7742204B2 (en) | 2004-04-30 | 2010-06-22 | Electronics For Imaging, Inc. | Methods and apparatus for determining a total colorant limit for digital imaging devices |
CN101401412A (en) | 2006-03-14 | 2009-04-01 | 佳能株式会社 | Color resolution method and video image processing device |
CN101544127A (en) | 2008-03-24 | 2009-09-30 | 兄弟工业株式会社 | Image-processing system |
WO2009138182A1 (en) | 2008-05-14 | 2009-11-19 | Padaluma Gmbh | Method for calibrating an inkjet printer and print product |
US7990592B2 (en) | 2008-05-27 | 2011-08-02 | Xerox Corporation | Methods and systems to produce consistent spot colors for multi-color print engines |
US20100085586A1 (en) * | 2008-10-06 | 2010-04-08 | Canon Kabushiki Kaisha | Target for color characterization of color printer |
CN101758665A (en) | 2008-12-25 | 2010-06-30 | 兄弟工业株式会社 | Print controller for controlling ink jet printer |
US8213055B2 (en) * | 2009-02-20 | 2012-07-03 | Hewlett-Packard Development Company, L.P. | Color separation into Neugebauer primary area coverage vectors |
US8270032B2 (en) * | 2009-10-26 | 2012-09-18 | Hewlett-Packard Development Company, L.P. | Generating color lookup table |
US9584700B2 (en) * | 2009-10-26 | 2017-02-28 | Hewlett-Packard Development Company, L.P. | Color separation table optimized for a printing process according to a print attribute by selecting particular Neugebauer primaries and Neugebauer primary area coverages |
US8363273B2 (en) * | 2009-10-26 | 2013-01-29 | Hewlett-Packard Development Company, L.P. | Printing system |
US8670167B2 (en) * | 2009-10-26 | 2014-03-11 | Hewlett-Packard Development Company, L.P. | Color gamut determination with neugebauer-primary area coverages for a print system |
US20110096344A1 (en) | 2009-10-26 | 2011-04-28 | Jan Morovic | Printing System |
US9185266B2 (en) | 2011-06-21 | 2015-11-10 | Eastman Kodak Company | Method of creating an ICC profile for a printing system |
US20150217587A1 (en) | 2012-07-31 | 2015-08-06 | Jacint Humet Pous | Continuous ink density selection method using a diagnostic plot in contone printers |
US9609177B2 (en) * | 2013-01-29 | 2017-03-28 | Hewlett-Packard Development Company, L.P. | To generate a print specification color separation look-up table |
US9674403B2 (en) * | 2013-04-22 | 2017-06-06 | Hewlett-Packard Development Company, L.P. | Creating a color gamut look-up-table |
EP2989782A1 (en) | 2013-04-22 | 2016-03-02 | Hewlett-Packard Development Company, L.P. | Spectral print mapping |
US20160255240A1 (en) * | 2013-10-30 | 2016-09-01 | Hewlett-Packard Development Company L.P. | Halftoning |
US9256815B1 (en) * | 2014-07-30 | 2016-02-09 | Hewlett-Packard Development Company, L.P. | Spectral print control based on specific spectral ranges of colorants |
US20160034796A1 (en) | 2014-07-30 | 2016-02-04 | Hewlett-Packard Development Company, L.P. | Spectral print control based on specific spectral ranges of colorants |
JP2016068358A (en) | 2014-09-29 | 2016-05-09 | 大日本印刷株式会社 | Printing method and printing system |
US20190238723A1 (en) * | 2016-10-24 | 2019-08-01 | Hewlett-Packard Development Company, L.P. | Color calibration |
US20200036866A1 (en) * | 2017-01-30 | 2020-01-30 | Hewlett-Packard Development Company, L.P. | Color calibration |
US10623606B2 (en) * | 2017-02-15 | 2020-04-14 | Hewlett-Packard Development Company, L.P. | Linearizing print outputs for a printing system |
Non-Patent Citations (1)
Title |
---|
Deshpande, K.; "N-colour Separation Methods for Accurate Reproduction of Spot Colours" May 2015; http://ualresearchonline.arts.ac.uk/8732/1/Deshpande-PhD-thesis-2015.pdf. |
Also Published As
Publication number | Publication date |
---|---|
CN109414937B (en) | 2020-08-18 |
CN109414937A (en) | 2019-03-01 |
EP3455079A1 (en) | 2019-03-20 |
EP3455079A4 (en) | 2019-12-25 |
US20190281191A1 (en) | 2019-09-12 |
WO2018080428A1 (en) | 2018-05-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10750057B2 (en) | Setting ink use limits for a printing system | |
US9674403B2 (en) | Creating a color gamut look-up-table | |
US9936102B2 (en) | Color mapping modeling printing device perturbations | |
US10893172B2 (en) | Color calibration | |
EP3135025B1 (en) | Color halftone processing | |
US9584700B2 (en) | Color separation table optimized for a printing process according to a print attribute by selecting particular Neugebauer primaries and Neugebauer primary area coverages | |
US10623606B2 (en) | Linearizing print outputs for a printing system | |
US11475257B2 (en) | Mapping between color spaces | |
WO2016066202A1 (en) | Configuring an imaging system | |
EP3135026B1 (en) | Generation of color mapping representative of a color halftone processing pipeline | |
US11057542B2 (en) | Color calibration | |
US10868919B2 (en) | Printer calibration adjusting NPac vector based on measurement data | |
US11397878B2 (en) | Printer calibration | |
US20220131998A1 (en) | Color prediction | |
US10897556B2 (en) | Generating an area coverage vector | |
US11310393B2 (en) | Clustering colors for halftoning | |
US11477346B2 (en) | Color calibration in a printing system | |
WO2017129253A1 (en) | Transforming color mappings | |
EP2989783B1 (en) | Creating a color gamut look-up-table | |
US11283965B2 (en) | Print calibration system and method | |
WO2024081021A1 (en) | Multiple halftone masks pixels allocation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HP PRINTING AND COMPUTING SOLUTIONS, S.L.U.;REEL/FRAME:049645/0451 Effective date: 20190603 Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MOROVIC, JAN;REEL/FRAME:049645/0344 Effective date: 20161024 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |